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Congratulations, you just made a fool of yourself. Check out this link and you will see what gators are and what they are used for. https://www.rei.com/learn/expert-advice/gaiters.html
They don't come above the knee and most importantly, they are not disposable. I suppose you could throw them away after each use but that might get expensive.
The plastic sleeves are for protecting your pants legs all the way up to your crotch. They are not for keeping sand or water or weather out of your shoes. The picture of my pants after weed eating proves that they work.